mirror of
https://github.com/classilla/tenfourfox.git
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181 lines
4.4 KiB
C++
181 lines
4.4 KiB
C++
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* vim: set ts=8 sts=4 et sw=4 tw=99: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* Code for throwing errors into JavaScript. */
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#include "xpcprivate.h"
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#include "XPCWrapper.h"
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#include "jsprf.h"
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#include "mozilla/dom/BindingUtils.h"
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#include "mozilla/dom/Exceptions.h"
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#include "nsStringGlue.h"
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using namespace mozilla;
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using namespace mozilla::dom;
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bool XPCThrower::sVerbose = true;
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// static
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void
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XPCThrower::Throw(nsresult rv, JSContext* cx)
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{
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const char* format;
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if (JS_IsExceptionPending(cx))
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return;
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if (!nsXPCException::NameAndFormatForNSResult(rv, nullptr, &format))
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format = "";
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dom::Throw(cx, rv, nsDependentCString(format));
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}
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namespace xpc {
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bool
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Throw(JSContext* cx, nsresult rv)
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{
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XPCThrower::Throw(rv, cx);
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return false;
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}
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} // namespace xpc
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/*
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* If there has already been an exception thrown, see if we're throwing the
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* same sort of exception, and if we are, don't clobber the old one. ccx
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* should be the current call context.
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*/
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// static
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bool
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XPCThrower::CheckForPendingException(nsresult result, JSContext* cx)
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{
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nsCOMPtr<nsIException> e = XPCJSRuntime::Get()->GetPendingException();
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if (!e)
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return false;
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XPCJSRuntime::Get()->SetPendingException(nullptr);
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nsresult e_result;
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if (NS_FAILED(e->GetResult(&e_result)) || e_result != result)
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return false;
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if (!ThrowExceptionObject(cx, e))
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JS_ReportOutOfMemory(cx);
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return true;
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}
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// static
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void
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XPCThrower::Throw(nsresult rv, XPCCallContext& ccx)
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{
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char* sz;
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const char* format;
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if (CheckForPendingException(rv, ccx))
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return;
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if (!nsXPCException::NameAndFormatForNSResult(rv, nullptr, &format))
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format = "";
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sz = (char*) format;
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NS_ENSURE_TRUE_VOID(sz);
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if (sz && sVerbose)
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Verbosify(ccx, &sz, false);
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dom::Throw(ccx, rv, nsDependentCString(sz));
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if (sz && sz != format)
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JS_smprintf_free(sz);
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}
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// static
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void
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XPCThrower::ThrowBadResult(nsresult rv, nsresult result, XPCCallContext& ccx)
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{
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char* sz;
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const char* format;
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const char* name;
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/*
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* If there is a pending exception when the native call returns and
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* it has the same error result as returned by the native call, then
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* the native call may be passing through an error from a previous JS
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* call. So we'll just throw that exception into our JS. Note that
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* we don't need to worry about NS_ERROR_UNCATCHABLE_EXCEPTION,
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* because presumably there would be no pending exception for that
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* nsresult!
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*/
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if (CheckForPendingException(result, ccx))
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return;
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// else...
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if (!nsXPCException::NameAndFormatForNSResult(rv, nullptr, &format) || !format)
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format = "";
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if (nsXPCException::NameAndFormatForNSResult(result, &name, nullptr) && name)
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sz = JS_smprintf("%s 0x%x (%s)", format, result, name);
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else
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sz = JS_smprintf("%s 0x%x", format, result);
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NS_ENSURE_TRUE_VOID(sz);
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if (sz && sVerbose)
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Verbosify(ccx, &sz, true);
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dom::Throw(ccx, result, nsDependentCString(sz));
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if (sz)
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JS_smprintf_free(sz);
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}
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// static
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void
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XPCThrower::ThrowBadParam(nsresult rv, unsigned paramNum, XPCCallContext& ccx)
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{
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char* sz;
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const char* format;
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if (!nsXPCException::NameAndFormatForNSResult(rv, nullptr, &format))
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format = "";
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sz = JS_smprintf("%s arg %d", format, paramNum);
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NS_ENSURE_TRUE_VOID(sz);
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if (sz && sVerbose)
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Verbosify(ccx, &sz, true);
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dom::Throw(ccx, rv, nsDependentCString(sz));
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if (sz)
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JS_smprintf_free(sz);
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}
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// static
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void
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XPCThrower::Verbosify(XPCCallContext& ccx,
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char** psz, bool own)
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{
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char* sz = nullptr;
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if (ccx.HasInterfaceAndMember()) {
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XPCNativeInterface* iface = ccx.GetInterface();
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jsid id = ccx.GetMember()->GetName();
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JSAutoByteString bytes;
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const char* name = JSID_IS_VOID(id) ? "Unknown" : bytes.encodeLatin1(ccx, JSID_TO_STRING(id));
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if (!name) {
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name = "";
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}
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sz = JS_smprintf("%s [%s.%s]", *psz, iface->GetNameString(), name);
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}
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if (sz) {
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if (own)
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JS_smprintf_free(*psz);
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*psz = sz;
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}
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}
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